Islamic Movement leader Raed Salah began his incarceration Sunday, having been sentenced to nine months in prison by a Jerusalem court for leading a violent demonstration and assaulting a police officer in the capital.
Salah was accompanied by some 100 supporters, including Arab MK's, to the jail.
Salah heads the northern branch of the Islamic Movement, a small, hardline group whose members come from Israel's one-fifth Arab minority. He has had repeated run-ins with Israeli authorities.
In 2003 Salah was jailed for two years on charges that his organization funneled money to Hamas.